This is a rare and great looking LIMBERT shade in excellent condition with no any damage, unmarked, sorry we no longer have the original base (lost in shipping).
You can see this Limbert lampshade in the GRAND RAPIDS ART METALWORK 1902-1918 by heartwood on page 130 picture 100 lantern; copper, opalescent stained glass.
This is apparently one of the lanterns shown in the Limbert Co. offices. 6 inches by 6.5 inches unmarked, private collection. we hoping to purchase this year the table lamp made of copper and brass, opalescent stain glass also unmarked.